Calvin Rankin has the ability to copy the powers, abilities, attributes, IQ, talents, fighting skills, and characteristics of anyone around him. Along with all those other things he can copy their physical appearance such as their skin color, bone structure, hair style and color, bone composition, voice, eye color, and other physical traits of those he mimics. When Calvin copies the abilities or powers of others he doesn't copy a persons flaws, an example would be Earth-616's Cyclops inability to control his optic blasts. He has copied the abilities of Charles Xavier among other members of the island of Genosha.

Not much is known about the origins of Calvin Rankin. All that is really known is that he received his powers from an experiment caused by his father, Ronald Rankin. Another aspect of his life which is known is that he received military training and became a mercenary or government agent.
Magneto and the mutants of Earth-58163 had recently achieved control of the island of Genosha, causing a great upheaval in the United States. After the death of his friend by mutant assassin Sabretooth, Graydon Creed assigned Nuke, Agent Barnes, and Calvin to infiltrate and destroy Genosha, Magento, and all the mutants on the island. Calvin, Nuke, and Barnes traveled to Genosha where Calvin blocked out the telepathic powers of Charles Xavier before copying the multiple powers of the vast number of mutants on the island in order to allow Barnes to sneak in and plant bombs throughout the island. The whereabouts of Calvin afterward are unknown.